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PDF XRD9826 Data sheet ( Hoja de datos )

Número de pieza XRD9826
Descripción 16-Bit Linear CIS/CCD Sensor Signal Processor
Fabricantes Exar Corporation 
Logotipo Exar Corporation Logotipo



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XRD9826
16-Bit Linear CIS/CCD Sensor
Signal Processor with Serial Control
FEATURES
· 16-Bit Resolution
· One-channel 6MSPS Pixel Rate
· Triple-channel 2MSPS Pixel Rate
· 6-Bit Programmable Gain Amplifier
· 8-Bit Programmable Offset Adjustment
· CIS or CCD Compatibility
· Internal Clamp for CIS or CCD AC Coupled
Configurations
· 3.3V or 5V Operation & I/O Compatibility
· Serial Load Control Registers
· Low Power CMOS: 200mW-typ
· Low Cost 20-Lead Packages
· USB Compliant
May 2000-3
APPLICATIONS
· Color and Grayscale Flatbed Scanners
· Color and Grayscale Sheetfed Scanners
· Multifunction Peripherals
· Digital Color Copiers
· General Purpose CIS or CCD Imaging
· Low Cost Data Acquisition
· Simple and Direct Interface to Canon 600 DPI
Sensors
GENERAL DESCRIPTION
The XRD9826 is a complete linear CIS or CCD sensor
signal processor on a single monolithic chip. The
XRD9826 includes a high speed 16-bit resolution ADC,
a 6-bit Programmable Gain Amplifier with gain adjust-
ment of 1 to 10, and 8-bit programmable input referred
offset calibration range of 800mV.
In the CCD configuration the input signal is AC coupled
with an external capacitor. An internal clamp sets the
black level. In the CIS configuration, the clamp switch
can be disabled and the CIS output signal is DC
coupled from the CIS sensor to the XRD9826. The CIS
signal is level shifted to VRB in order to use the full
range of the ADC. In the CIS configuration the input
can also be AC coupled similar to the CCD configura-
tion. This enables CIS signals with large black levels
to be internally clamped to a DC reference equal to the
black level. The DC reference is internally subtracted
from the input signal.
The CIS configuration can also be used in other
applications that do not require CDS function, such as
low cost data acquisition.
ORDERING INFORMATION
PackageType
20-Lead SOIC
20-LeadSSOP
TemperatureRange
0°C to +70°C
0°C to +70°C
PartNumber
XRD9826ACD
XRD9826ACU
Rev. 1.00
EXAR Corporation, 48720 Kato Road, Fremont, CA 94538 (510) 668-7000 FAX (510) 668-7017 www.exar.com

1 page




XRD9826 pdf
XRD9826
ELECTRICAL CHARACTERISTICS (CONT'D)
Test Conditions: AV =DV =5V, ADCCLK=6MHz, 50% Duty Cycle, T =25°C unless otherwise specified.
DD DD
A
Symbol
Parameter
Buffer Specifications
I
IL
CIN
VINPP
Input Leakage Current
Input Capacitance
AC Input Voltage Range
AC Input Voltage Range
VIN DC Input Voltage Range
DC Input Voltage Range
Min.
Typ.
Max. Unit Conditions
10
0
0
-0.1
VDCEXT-0.1
100
AVDD-1.4
nA
pF
V
DV
REF
V
AVDD-1.4 V
VDCEXT+
DVREF
V
CIS AC; INT VDCREF
Config Reg
=> XXX010XX
Gain=1 (Note 1)
CCD AC; INT V
DCREF
Config Reg
=> XXX011XX
Gain=1 (Note 1)
CIS DC; INT VDCREF
Config Reg
=> XXX000XX
Gain=1 (Note 2)
CIS DC; EXT VDCREF
Config Reg
=> XXX100XX
Gain=1 (Note 3)
V +DV < AV
DCEXT
REF
DD
VDCEXT
External DC Reference
VINBW
VIN
CT
Input Bandwidth
Channel to Channel Crosstalk
Internal Clamp Specifications
V
CLAMP
Clamp Voltage
R Clamp Switch On Resistance
INT
ROFF Clamp Switch Off Resistance
0.3 AVDD/2 V CIS DC; EXT VDCREF
Config Reg
=> XXX100XX
3 MHz
-60 -50 dB f =3MHz
in
AGND
50
mV CIS (AC) Config
3.5 V
RT
V CCD (AC) Config
100 150
10 M
Note 1: VINPP is the signal swing before the external capacitor tied to the MUX inputs.
Note 2: The -0.1V minimum is specified in order to accommodate black level signals lower than the external DC
reference (clamp) voltage.
Note 3: The VDCEXT-0.1V minimum is specified in order to accommodate black level signals lower than the external DC
reference voltage.
Rev. 1.00
5

5 Page





XRD9826 arduino
XRD9826
VCC (5V - 15V)
AVDD
C
I
S
19
RED
N/C
18
GRN
N/C
17
BLU
DB7/LD
DB6/SDATA
DB5/SCLK
DB4
DB3
DB2
DB1
DB0
9
8
7
6
5
4
3
2
16
VDCEXT
ADCCLK 11
15
VREF+
CLAMP
SYNCH
12
13
0.1uF
AVDD
DVDD (3V - 5V)
20
AVDD
DVDD
1
14
AGND
10
DGND
AGND
XRD9826
DIGITAL
ASIC
DGND
Figure 5. Typical Application Circuitry CIS DC Coupled Non-Inverted Mode
Rev. 1.00
11

11 Page







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